C. Doctor india is an iso 9001: 2000 certified company manufacturing centrifugal fans, axial fans, jet fans, shell & tube heat exchangers, finned tube coolers & heaters, steam coil air preheaters etc. Cacw is an extended surface type heat-exchanger, which is used to cool the hot air to the atmospheric temperature by means of cooling water available from the cooling tower. These equipment specifically are used for cooling of heavy duty ac/ dc motors and alternator.